Andrew lamb and william alltoft summers



' spaces.

UNITED STATES ATnNT rrrcn.

ANDREV LAMB AND VILLIAM ALLTOFT SUMMERS, OF THE COUNTY OF HANTS, ENGLAND.

STUD-BRACE FOR FLUES OF SHEET WATER-SPACE BOILIERS.

Specification forming part of Letters Patent No. @,Ql), dated April 27, 1852.

T0 all whom it may concern:

Bc it known that we, ANDREW LAMB and WILLIAM ALLTOFT SUMMERs, of the county of Hants, in the Kingdom of Great Britain, have invented certain new and useful 1mprovements in the Boilers of Steam-Engines; and we do hereby declare that the following is a full, clear, and exact description of the principle or character which distinguishes them from all other things before known and of the usual manner of making, modifying, and using the same, reference being had to the accompanying drawings, forming a part of the same.

Our invention relates to certain improvements, hereinafter described, in` the manner of staying or bracing what is commonly termed the Lamb and Summers boiler, or sheet water-space boiler.

The general arrangement of `this kind of boiler is shown in Figures 5, 6, and 7. In this kind of boiler the tubes or flues are made flat-sided, instead of circular, and stayed or braced in the fire-spaces, instead of water- The flues or tubes are made very narrow, in order that a larger amount of efficient heating-surface maybe placed in a given space than is practicable with circular tubes or iiues; also, readier access can be obtained to all those parts of the boiler liable to be` come chocked with soot or deposit.

The manner in which the lues may be made is shownin Figs. l, 2, 3, and et.

Our invention consists in the manner of staying or bracing the before-described flatsided flues in the fire or heat spaces 5, and its peculiarity consists in using a stud-brace, as shown in Fig. 8. stud-brace is as follow: A piece of viron of any section convenient and of the proper length, regulated by the width of the flue, is taken and a collar, A, formed on it, to abut against `011e side of the flue, which iiue is pierced to receive the part of the stud B continued past the collar A, which part B, after being passed through the side of the flue, is riveted over, as shown at C. The other end of the stud B simply abuts against the other side of the flue, and is not fastened to it. The pressure being on the outside of the fines, the braces have only to act in preventing a collapse. The boiler The manner of forming this is to be provided with an atmospheric valve opening into its interior, to prevent any less pressure than the atmospheric pressure to eX- ist there, which less pressure might cause an injurious strain on the iiues.

Ve are aware that the lines may be braced in the usual manner of bracing iiat surfaces in steam-boilers-viz., by screwing the ends of the brace through the sides of the flue, or by using a socket and bolt, which socket is a metal cylinder enveloping the bolt and having its ends abutting against the sides of the flue, the bolt being held by a head and nut, or by means of a flat plate of metal supported by lugs or projections fastened to the sides of the ue and extending throughout the length of the iiue. To these methods our method is superior in the following respects: First, it requires less weight of materials, as our studbrace is less in length than any of the others and of less section also, excepting, in this respect alone, the screw-brace; second, less labor in workmanship, having only one end fastened, instead of both ends, and also by having that end fastened on the sheet composing one side of the iiue before the said sheet is made into the iiue, as it is then more accessible to work at. The sheet composing the other side of the liue has only to be brought up against the studs, and the iiue is complete.

The inferiority of the socket-and-bolt method consists in the greater amount of materials and labor required-viz., the envelopingsocket, the screw cut on thebolt, the head and nut of the bolt, and the greater length of bolt. The inferiority of the screw-brace method consists in the greater amount of materials an d labor, greater liability to destruction, and less security. There is greater amount of materials, because a greater length of brace is required; greater amo unt of workmanship, because a screw has to be cut on the whole length of the bolt and in the sides of the flue, and the holes in the sides of the flue have to be made carefully opposite each other and at right angles to the sides of the -flues There is more liability to destruction, because the water will percolate in between the threads of the screw and destroy them by corrosion; less security, because there are only the screwthreads in a thin piece of metal, the sides of the lue never exceeding one-fourth inch in In witness whereof We, the said ANDREW thickness to sustain the entire pressure. The LAMB and WILLIAM ALLTOFT SUMMERS, have plate-bracing is inferior7 because it does not hereunto set our hands this 6th day of June,

conduct the heat to the Water7 and Will rapin the year of our Lord 1849.

idly Warp and burn out by the heat. It is also of vastly greater Weight and more cost. ANDW. LAMB.

What We claim as our invention, and desire W. A. SUMMERS.

lo secure by Letters Patent, is-

y The std-brace for bracing the at surfaces Vtnesses:

of steam-boilers, substantially as described LEM. D. WILLIAMS, in the foregoing. F. JOHNSON. 

